Synthesis, structures and conductivity properties of silver 3-sulfobenzoate coordination polymers

Four coordination polymers based on AgI/3-sulfobenzoate/N-donor ligands, [Ag2Na2(3-sb)2(H2O)7]n (1), {[Ag2(3-sb)(apy)]·(H2O)}n (2), {[Ag2(4,4′-bipy)2(H2O)3]·[Ag2(4,4′-bipy)2(H2O)2]·2(3-sb)·4(H2O)}n (3) and {[Ag(3-sb)(bpe)(H2O)][Ag(bpe)(H2O)]·3(H2O)}n (4) where 3-sb is 3-sulfobenzoate, apy is 2-aminopyridine, bipy is 4,4′-bipyridine and bpe is 1,2-bis(4-pyridyl)ethylene, were prepared and characterized, and their fluorescence and electric conductivity properties were studied. Complex 1 is a 3D architecture in which 3-sb ligands exhibit μ4-κ1(O1,O2-Ag): κ1(O3,O5-Na) trans–trans coordination mode. The molecular structure of 2 is a 2D layer. Complexes 3 and 4 are cation–anion species and 1D polymers. In these complexes hydrogen bonds provide additional assembly forces, giving 3D hydrogen bonding networks for 1 and 3, and 2D layers for 2 and 4. Abundant weak interactions, such as Ag–Ag interactions in 1–3, Ag–π interactions in 1–4, π–π interactions in 1, 3–4, and C–H···π interactions in 3–4, also can be found. The weak interactions are strongly related to the fluorescence and electric conductivity properties, providing the way for understanding the relationship between structures and properties.

Graphical abstractFour coordination polymers based on AgI/3-sulfobenzoate/N-donor ligands were prepared. Hydrogen bonds and abundant weak interactions can be observed in these complexes and the weak interactions are strongly related to the fluorescence and electric conductivity properties.Figure optionsDownload full-size imageDownload as PowerPoint slide